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The effect of glycemic control and duration of diabetes on cholesterol and phospholipid classes in erythrocytes of type I diabetes.

Abnormalities in the lipid composition of erythrocytes can alter blood rheology and viscosity. These alterations have been implicated in the pathogenesis of microvascular disease in diabetic patients. The present study was undertaken to examine whether or not long-term glycemic control or duration of diabetes has any role in the altered membrane cholesterol and phospholipid composition of erythrocytes in type I diabetes. Long-term glycemic control was assessed by measuring glycosylated hemoglobin (GHb) from diabetic patients and age-matched normal volunteers. There was no significant correlation between GHb or duration of diabetes with total cholesterol, phospholipid, and cholesterol to phospholipid molar ratios in erythrocytes of these patients. Among phospholipid classes, GHb showed a significantly negative relationship with sphingomyelin (SM) (r = .55, P less than .01) levels, but was not related to phosphatidylcholine (PC) and phosphatidylethanolamine (PE) levels of erythrocytes. Duration of diabetes had no effect on SM, PC, or PE levels of erythrocytes.

Adolescent↗

Suppression of nocturnal fatty acid concentrations by bedtime carbohydrate supplement in type 2 diabetes: effects on insulin sensitivity, lipids, and glycemic control.

BACKGROUND: Bedtime ingestion of slow-release carbohydrates leads to sustained nocturnal fatty acid suppression and improved glucose tolerance in type 2 diabetic patients. OBJECTIVE: This study assessed the effects of 2 different doses of bedtime carbohydrate supplement (BCS) on morning glycemic control and glycated hemoglobin (Hb A(1c)) in type 2 diabetic patients. In addition, the effects of the high-dose BCS on insulin sensitivity and postprandial glucose and triacylglycerol concentrations were assessed. DESIGN: Two BCS doses were studied separately in 7-wk randomized, placebo-controlled, double-blind studies with either a parallel (low-dose BCS; n = 24 patients) or crossover (high-dose BCS; n = 14 patients) design. The effects of the low and high doses (0.30 and 0.55 g uncooked cornstarch/kg body wt, respectively) were compared with those of a starch-free placebo. RESULTS: Compared with the starch-free placebo, the high-dose BCS ( approximately 45 g) produced enhanced nocturnal glucose (P < 0.01) and insulin (P < 0.01) concentrations as well as a 32% suppression of fatty acid concentrations (P < 0.01). Moreover, glucose tolerance (P < 0.05) and C-peptide response (P < 0.05) improved after breakfast the next morning. The low-dose BCS ( approximately 25 g) improved fasting blood glucose concentrations (P < 0.05). However, there were no improvements in insulin sensitivity, postprandial triacylglycerol concentrations, or Hb A(1c) after 7 wk. CONCLUSION: Nocturnal fatty acid suppression by BCS improved fasting and postprandial blood glucose concentrations in type 2 diabetic patients the next morning. In contrast, no improvements in insulin sensitivity, postprandial triacylglycerol concentrations, or long-term glycemic control assessed by Hb A(1c) were seen after BCS supplementation.

Blood Glucose↗

Plasma immunoreactive somatostatin response to arginine after glycemic control with continuous subcutaneous insulin infusion in type I diabetics.

The effects of 3 wk of near normoglycemia by continuous subcutaneous insulin infusion (CSII) on plasma immunoreactive somatostatin (IRS) responses to arginine (0.5 g X kg-1 X 30 min-1) in seven patients with insulin-dependent diabetes mellitus (IDDM) were compared with the same patients in poor glycemic control during conventional insulin therapy (CIT) and with seven normal controls. After 3 wk of CSII treatment, mean daily blood glucose and HbA1 decreased to mean (+/- SE) values of 129 +/- 6 mg/dl and 8.0 +/- 0.1%, respectively. Plasma free-insulin levels in IDDM patients 30 min before a meal during CSII were significantly higher than those during CIT or in normal controls. Fasting mean plasma IRS levels of the IDDM patients during CSII (7.3 +/- 1.4 pg/ml) were not different from those during CIT (8.4 +/- 1.3 pg/ml) and in normal controls (5.9 +/- 0.8 pg/ml). Arginine elicited a rise in plasma IRS during CIT in all seven IDDM patients during CIT and in the normal controls, with peak values of 18.2 +/- 4.1 and 12.5 +/- 1.8 pg/ml, respectively. However, no significant increase in plasma IRS was observed in all seven IDDM patients during CSII. The integrated values of plasma IRS during the arginine-infusion study of the IDDM patients treated with CIT were significantly higher than those of the normal controls. The increased integrated values of plasma immunoreactive glucagon response to arginine observed during CIT became normalized after CSII. These results suggest that glycemic control with CSII in IDDM patients suppresses the increased plasma IRS response to arginine that occurs during CIT.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

Glycemic control in the ICU: a multicenter survey.

BACKGROUND: Intensive insulin therapy has recently been shown to decrease morbidity and mortality in the critically ill population in a large randomized clinical trial. OBJECTIVE: To determine the beliefs and attitudes of ICU clinicians about glycemic control. DESIGN: Self-administered survey. PARTICIPANTS: ICU nurses and physicians in five university-affiliated multidisciplinary ICUs. RESULTS: A total of 317 questionnaires were returned from 233 ICU nurses and 84 physicians. The reported clinically important threshold for hypoglycemia was 4 mmol/l (median, IQR 3-4 mmol/l). In non-diabetic patients, the clinically important threshold for hyperglycemia was 10 mmol/l (IQR 9-12 mmol/l); however, nurses had a significantly higher threshold than physicians (difference of 0.52 mmol/l (95% CI 0.09-0.94 mmol/l, P=0.018). In diabetic patients, the clinically important threshold for hyperglycemia was also 10 mmol/l (IQR 10-12 mmol/l), and again nurses had a significantly higher threshold than physicians (0.81 mmol/l, 95% CI 0.29-1.32 mmol/l, P=0.0023). Avoidance of hyperglycemia was judged most important for diabetic patients (87.7%, 95% CI 84.1-91.3%), patients with acute brain injury (84.5%, 95% CI 80.5-88.5%), patients with a recent seizure (74.4%, 95% CI 69.6-79.3%), patients with advanced liver disease (64.0%, 95% CI 58.7-69.3%), and for patients with acute myocardial infarction (64.0%, 95% CI 58.7-69.3%). Physicians expressed more concern than nurses about avoiding hyperglycemia in patients with acute myocardial infarction ( P=0.0004). ICU clinicians raised concerns about the accuracy of glucometer measurements in critically ill patients (46.1%, 95% CI 40.5-51.6%). CONCLUSIONS: Attention to these beliefs and attitudes could enhance the success of future clinical, educational and research efforts to modify clinician behavior and achieve better glycemic control in the ICU setting.

Attitude of Health Personnel↗

Effect of non-surgical periodontal therapy on glycemic control in patients with type 2 diabetes mellitus.

BACKGROUND: The literature suggests that an alteration in glucose metabolism occurs as a result of antibacterial periodontal therapy. The objective of this study was to monitor the effect of non-surgical periodontal therapy on glycemic control in patients with type 2 diabetes mellitus (DM). METHODS: Thirty type 2 DM subjects with periodontitis were randomly divided into two groups. Group 1 (G1), 15 subjects, received one-stage full-mouth scaling and root planing (FMSRP) plus amoxicillin/clavulanic acid 875 mg; group 2 (G2), 15 patients, received only FMSRP. At baseline and after 3 months, the glycated hemoglobin (HbA1c) values, fasting glucose, and clinical parameters (with computerized probing and individualized acrylic stents) were recorded. Following therapy, the subjects were enrolled in a 2-week interval maintenance program for 3 months. RESULTS: After treatment, both groups showed clinical improvements. A probing depth (PD) reduction of 0.8 +/- 0.6 mm (P < 0.05) occurred in G1 and 0.9 +/- 0.4 mm in G2 (P < 0.05), but there were no significant changes in attachment level. Treatment reduced the HbA1c values after the 3-month observation period in both groups; however, the reduction in HbA1c values for the G2 group was statistically significant, but not for the G1 group. The changes in fasting glucose levels were not significant for either group. CONCLUSIONS: Periodontal therapy improved glycemic control in patients with type 2 DM in both groups; however, the reduction in HbA1c values reached statistical significance only in the group receiving scaling and root planing alone [correction].

Amoxicillin-Potassium Clavulanate Combination↗

Long-term impact of chronic hemodialysis on glycemic control and serum lipids in insulin-treated type 2-diabetic patients.

UNLABELLED: There are only a few data in the literature concerning metabolic control in insulin-treated diabetic patients with end stage renal disease (ESRD). The aim of the study was to find out the long-term impact of hemodialysis on glycemic control and lipid values in type 2 diabetic patients. Twenty insulin-treated type 2 diabetic patients (age 62 +/- 9 years, f:m=6:14) were evaluated. We compared HbAlc, fasting blood glucose (FBG), body weight, serum lipids, insulin requirement, and blood-pressure (BP) 12 and 6 months before dialysis, at the start of dialysis, and 6 as well as 12 months after the start. RESULTS: The mean HbA1c- and FBG-values were not significantly different before and after the start of dialysis therapy. The average insulin requirement was 26 +/- 10 IU/day in the predialysis period, 25 +/- 12 IU/day at the start, and 24 +/- 13 as well as 22 +/- 13 IU/day after the start of dialysis. The mean cholesterol level fell significantly from 199 +/- 63 and 190 +/- 49 mg/dL in the predialysis phase to 167 +/- 62 and 157 +/- 38 mg/dL after dialysis began. The triglyceride concentrations decreased only slightly after the start of dialysis. The incidence of hypoglycemia (n/patient/month) was markedly lower in the predialysis phase (0.4 vs. 0.6, NS) than after start of dialysis. In patients with residual diuresis (<500 mL urine/day) the needed insulin doses decreased significantly by 29% compared to patients with higher residual diuresis, whose insulin requirement remained unchanged. In summary, hemodialysis had no significant long-term effect on glycemic control in insulin-treated type 2 diabetic patients, but incidence of hypoglycemia tended to be higher under hemodialysis than in the predialysis period. Lipid levels tended to be lower after the initiation of dialysis therapy. Insulin requirement under hemodialysis decreased only in patients with loss of residual urine volume (below 500 mL urine/day).

Biomarkers↗

Metformin adjunctive therapy with insulin improves glycemic control in patients with type 1 diabetes mellitus: a pilot study.

Metformin lowers blood glucose by reducing hepatic glucose output and improving insulin sensitivity without requiring an increase in circulating insulin concentration. We hypothesized that metformin could be used adjunctively with insulin to improve glycemic control in type 1 diabetes mellitus (DM). We conducted a 6-month open-label pilot study in 10 adolescents and young adults with type 1 DM, 19.1 +/- 3.4 years, 4 males, 6 females, and body mass index 26.3 +/- 3.1 kg/m2. Patients started metformin at a dose of 250 mg b.i.d.; the dose was increased until blood glucose was within an optimal target range or a maximum of 2,500 mg/d was reached. Insulin dose was reduced as needed to prevent hypoglycemia. Seven patients had an average decrease in HbA(1c) of 11% from pretreatment. These responders had no change in insulin dose, BMI or lipid levels during the study. Three patients had no improvement of HbA(1c) on therapy. We conclude that some patients with type 1 DM will have improved glycemic control on adjunctive metformin therapy. Evaluation of the long-term benefit and safety of adjunctive therapy in patients with type 1 DM is warranted.

Adolescent↗

Perioperative glycemic control and the risk of infectious complications in a cohort of adults with diabetes.

OBJECTIVE: Although hyperglycemia is hypothesized to increase the short-term risk of infection, this hypothesis has not been well tested in a clinical setting. This study was designed to assess the relationship of perioperative glycemic control to the subsequent risk of infectious complications. RESEARCH DESIGN AND METHODS: A total of 411 adults with diabetes who underwent coronary artery surgery from 1990 to 1995 in the cardiac surgery service of an urban university hospital were included in a nonconcurrent prospective cohort study based on chart review. Perioperative glycemic control was characterized by the mean of six capillary glucose measurements taken during the 36-h interval following surgery. The major outcomes studied were infections of leg and chest wounds, pneumonia, and urinary tract infections. RESULTS: Mean postoperative glucose levels ranged from 121 to 352 mg/dl and were divided into quartiles: quartile 1 (121-206 mg/dl), quartile 2 (207-229 mg/dl), quartile 3 (230-252 mg/dl), and quartile 4 (253352 mg/dl). After simultaneous adjustment for age, sex, race, underlying comorbidity, acute severity of illness, and the length of the stay in the surgical intensive care unit, patients with higher mean capillary glucose readings were at increased risk of developing infections. Compared with people in the lowest quartile of postoperative glucose, those in quartiles 2 (relative odds of infection [95% CI] = 1.17 [0.57-2.40]), 3 (1.86 [0.94-3.68]), and 4 (1.78 [0.86-3.47]) were at progressively higher risk for infection (P = 0.05 for trend). CONCLUSIONS: In patients with diabetes who undergo coronary artery surgery, postoperative hyperglycemia is an independent predictor of short-term infectious complications. Physicians should consider a glucose concentration target of < or =200 mg/dl to reduce the risk of infection.

Blood Glucose↗

[The effects of a diabetic educational program for coping with problem situation on self-efficacy, self care behaviors, coping and glycemic control in type 2 diabetic patients].

PURPOSE: This study was conducted to develop and to test the effects of an educational program for coping with problem situations as a nursing intervention in the diabetic patient. METHOD: A non-equivalent control group pretest-posttest design was used in this study. Data were collected from January to March, 2002. The subjects of the study consisted of 31 diabetic patients(experimental group: 17 patients, control group: 14 patients). The intervention of an educational program for coping with problem situations was applied to the experimental group for 4 weeks (total 8 hours). Data were collected before the educational program, immediately after and 1 months later and were analyzed with repeated measures ANOVA, t-test, and paired t-test. RESULT: 1. There was a significant difference in self efficacy between the experimental and control groups (F=13.793, p=0.001). 2. There was a significant difference in self care behavior between the experimental and control groups (F=4.583, p=0.041). 3. There was a significant difference in coping behavior of the problem situation between the experimental and control groups (F=62.018, p=0.000). There was a significant difference according to experimental stages (F=4.546, p=0.015) and interaction between education and experimental stages (F=12.039, p=0.000). 4. There was a significant difference in glycemic control between the experimental and control groups (t=-3.112, p=0.004). CONCLUSION: These results support that a diabetic educational program for coping with problem situations is effective in promoting and maintaining self efficacy, self care behavior, problem coping behaviors and in improving glycemic control. Thus this program can be recommended as an effective nursing intervention of in-depth education for diabetic patient.

Adaptation, Psychological↗

Improving glycemic control: the case for self-monitoring blood glucose levels.

Diabetes can be potentially identified, monitored, treated, and prevented more easily now than at any other time in history. Yet, the prevalence of diabetes continues to grow and the complications associated with it continue to afflict millions of Americans. Glycemic control, or the maintenance of appropriate levels of blood sugar, measured through the self-monitoring of blood glucose or a glycated hemoglobin test, represents the best opportunity for persons with diabetes to prevent complications by helping them understand the effect of their lifestyle choices and medications on their health. Despite the numerous advantages of glycemic control, a number of barriers prevent individuals from monitoring their blood sugar concentrations and achieving the health benefits that come with the proper understanding of their condition.

Blood Glucose↗

The acute effects of glycemic control on axonal excitability in human diabetics.

In diabetic nerves, the activation of the polyol pathway and a resulting decrease in Na(+)-K(+) ATPase activity lead to intra-axonal Na(+) accumulation and a smaller Na(+) gradient across the axolemma than normal. To investigate whether glycemic control is associated with acutely reversible changes in axonal excitability and Na(+) conductance, we measured the multiple excitability indices (strength-duration time constant, rheobase, refractoriness, and refractory period) of the median motor axons of 21 diabetic patients before and after intensive insulin treatment. Within 4 weeks after treatment was begun, there was a significant improvement in nerve conduction velocities, associated with increased strength-duration time constant, decreased rheobase, increased refractoriness, and prolonged refractory periods. Assuming that the strength-duration time constant partly reflects persistent Na(+) conductance, and that refractoriness/refractory periods depend on inactivation of transient Na(+) channels caused by prior depolarization (the influx of Na(+)), the patterns of changes in these indices may reflect a reduced trans-axonal Na(+) gradient during hyperglycemia and its restoration by glycemic control in diabetic patients. Measurement of the excitability indices could provide new insights into the pathophysiology of human diabetic neuropathy.

Action Potentials↗

Strength-duration properties and glycemic control in human diabetic motor nerves.

OBJECTIVE: To investigate the influences of hyperglycemia on axonal excitability in human diabetic nerves. Hyperglycemia results in decreased Na+-K+ pump function, presumably leading to intra-axonal Na+ accumulation and thereby, reduced Na+ currents. METHODS: The strength-duration time constant (tau(SD)), which partly depends on persistent Na+ conductance active at the resting membrane potential, was measured in median motor axons of 79 diabetic patients. The relationship of tau(SD) with the state of glycemic control (hemoglobin A1c [HbA1c] levels) was analyzed. RESULTS: The mean tau(SD) was longer for diabetic patients than for normal controls, but the difference was not significant. Among diabetic patients, the subgroup of patients with good glycemic control (HbA1c<7%) had significantly longer tau(SD) than the patient group with poor control (HbA1c>9%; P=0.04). The mean tau(SD) was longest at the HbA1c level of 5-6%, gradually decreasing and reaching a plateau around the HbA1c level of 9%. There was an inverse relationship between HbA1c levels and tau(SD), when the HbA1c levels ranged from 5 to 9% (P=0.04). CONCLUSIONS: In diabetic nerves, tau(SD) is generally longer than normal, but hyperglycemia is associated with paradoxically shortened tau(SD), because of a decrease in axonal persistent Na+ conductance, possibly related to reduced membranous Na+ gradient, tissue acidosis, or other metabolic factors. SIGNIFICANCE: Measurements of tau(SD) could provide a new insight into changes in ionic conductance in human diabetic nerves.

Adult↗

Progression of coronary artery calcification in type 1 diabetes: the importance of glycemic control.

OBJECTIVE: Coronary artery disease (CAD) occurs earlier in life and is more often fatal in people with type 1 diabetes. This excess risk seems to be higher than in those with type 2 diabetes and is poorly explained by conventional risk factors. The role of glycemic control is controversial and has not been previously addressed in a prospective manner using a reliable marker for subclinical CAD, such as coronary artery calcification (CAC), measured by electron beam computed tomography (EBCT). RESEARCH DESIGN AND METHODS: We measured CAC twice during an interval of 2.7 years in 109 men and women with type 1 diabetes (aged 22-50 years). Progression of CAC was found in 21 patients, based on change in the square root-transformed volume score. RESULTS: In multiple logistic regression, CAC progression was associated with baseline hyperglycemia (odds ratio [OR] 7.11, 95% CI 1.38-36.6, P = 0.02), adjusted for the presence of CAC at baseline (P = 0.01), duration of diabetes (P = 0.02), sex (P = 0.09), and age (P = 0.27). There was also a significant interactive effect of higher insulin dose and higher BMI (P = 0.03). CONCLUSIONS: In conclusion, in this young cohort with type 1 diabetes, suboptimal glycemic control (HbA(1c) >7.5%) was a strong risk factor for progression of CAC. Insulin resistance may also play a role.

Adult↗

Glycemic control and not protein kinase C inhibition prevents the early decrease of glutathione peroxidase activity in peripheral nerve of diabetic mice.

Experimental diabetes promotes changes in biochemical activities of peripheral nervous tissue. Glutathione peroxidase activity decreases in sciatic nerve of diabetic mice very early after onset of experimental diabetes. Effective glycemic control with insulin restores the early lost glutathione peroxidase activity in peripheral nerve of diabetic mice to control values. Data are also presented demonstrating that glutathione peroxidase activity in diabetic mouse peripheral nerve is not modified by the constant delivery of calphostin C, a protein kinase C inhibitor, therefore this decrease seems to be independent on a protein kinase C mediated mechanism. Thus, the early glutathione peroxidase activity decrease in peripheral nerve of diabetic mice is closely related to hyperglycemia, and a tight glycemic control is rather effective in restoring the control levels of this enzymatic activity. The results herein do not rule out the benefits of antioxidant adjuvant therapies in diabetes to help recover the overall decrease in antioxidant defense in peripheral nerve elicited by the decrease of glutathione peroxidase activity.

Animals↗

Overcoming turf battles: developing a pragmatic, collaborative model to improve glycemic control in patients with diabetes.

BACKGROUND: Collaboration between primary care physicians (PCPs) and endocrinologists should be the first step in improving care of patients with diabetes. However, the coordination of care between specialists and PCPs often does not work well. At Vanderbilt University Medical Center, a collaborative model between PCPs and endocrinology was used in an effort to improve glycemic control for patients with diabetes. METHODS: In 1998 a project team was formed; the team members attempted to find ways to improve the care of patients with diabetes, specifically patients with poor glycemic control. The team proceeded through ten iterations of the model before reaching one accepted by all-one with clear responsibilities and referral criteria. RESULTS: Survey results indicated a high level of satisfaction with the collaborative model among patients and PCPs. Appropriate referrals to the diabetes improvement program--a 12-week outpatient program consisting of instruction and support in diabetes self-management coupled with adjustment of insulin and oral hypoglycemic medications-increased during the team effort, and a control chart indicated a change in the process that was significant and sustained. The patients enrolled in the program experienced a reduction of mean glycated hemoglobin levels from 9.2% at entry to 7.5% after 3 months (p < 0.05). DISCUSSION: An initial first step to improving care is to create an environment of trust and collaboration between the PCPs and specialists who assist in that care. After this collaboration has been established, many of the improvements identified in other studies can more easily be implemented.

Adult↗

Improved glycemic control among Thai children and young adults with type 1 diabetes participating in the diabetes camp.

Diabetes Education Program, Faculty of Medicine Siriraj Hospital has provided summer camps for Thai children with type 1 diabetes since 1990. The objective of this study was to evaluate the effectiveness of the diabetes camp in glycemic control. Twenty male and forty-two female patients participated in the 5-day diabetes camp held in Karnchanaburi, Thailand in 2003. The mean age was 14.1 +/- 4.3 years and the mean duration of disease was 4.5 +/- 3.5 years. Fifty out of sixty-two patients returned for a 3-month-postcamp visit. The glycemic control improved significantly. The mean precamp and postcamp HbA1c levels were 10.0 +/- 3.1% and 9.0 +/- 2.6% (p = 0.008) respectively. The diabetes camp is a valuable program for patients to learn diabetes-self management skills, especially in countries where the diabetes education programs are not always available.

Adolescent↗

New insulin replacement technologies: overcoming barriers to tight glycemic control.

New insulin analogues act more quickly, allowing better postprandial glycemic control and making intensive control easier. New methods of delivering insulin, notably inhaled insulin, will soon provide alternatives to painful injections. Improved glucose sensors may eventually make an artificial pancreas possible.

Administration, Inhalation↗

The use of insulin pumps with meal bolus alarms in children with type 1 diabetes to improve glycemic control.

OBJECTIVE: The aim of this study was to determine whether the use of meal bolus alarms would result in fewer missed meal boluses per week in youth with type 1 diabetes using continuous subcutaneous insulin infusion (CSII) therapy. RESEARCH DESIGN AND METHODS: This was a randomized trial of 48 youth using CSII, who were in suboptimal glycemic control with HbA(1c) (A1C) values > or =8.0%. Twenty-four subjects were randomized to use a Deltec Cozmo insulin pump with meal bolus alarms (experimental group), while the other 24 subjects continued use of their current insulin pumps (control group) without meal bolus alarms. RESULTS: After 3 months of study, the number of missed meal boluses per week was significantly lower in the experimental group (from 4.9 +/- 3.7 to 2.5 +/- 2.5; P = 0.0005) but not significantly lower in the control group (from 4.3 +/- 2.7 to 4.2 +/- 3.9; P = 0.7610). Also after 3 months, the mean A1C value of the experimental group declined significantly (from 9.32 +/- 1.12 to 8.86 +/- 1.10; P = 0.0430). No significant decline in A1C was present for the control group (from 8.93 +/- 1.04 to 8.67 +/- 1.17; P = 0.1940). After 6 months of study, the significant decline in A1C from baseline in the experimental group was no longer present. Pooling of all available data from the control and experimental groups showed that at baseline and 3 and 6 months, the number of missed meal boluses per week was significantly correlated with A1C values. CONCLUSIONS: While meal bolus alarms may have the potential to improve suboptimal glycemic control in youth using CSII, our results demonstrated that these alarms had only a transient, modest effect in doing so.

Adolescent↗